>David, have you read the Dragan's reply?
>It seems that it is possible to do it using 3 report variables.
>Vars are calculated in the order as they apper in the variable list.
>
>The trick is that second variable expression uses inside iif()
>the value of third variable. This allows to sum previous group when
>in the next group header !
>This work faster since calling udf from reports is slow.
>What do you think about this?
>
Well I would have thought it possible. And that's what I was attempting when I came up with the solution I sent you. I wouldn't normally worry about calling UDFs from a form, unless there's 10000's of them. I would worry about keeping it understandable and it's easier to document a UDF (prg) than the report form variables.

>I tried to use Lisa's coolbutton class but without success.
>She wastes her time for application generator as I read from her
>article in the ms vfp site.

I haven't been following what Lisa's been up to lately. I think perhaps, her application generators are "too" clever and may take an above average commitment (and knowledge) to master. I don't know, I only say that because of what I know about her.